Why should the air film machine (bubble film machine) screw and barrel surface be coated with anti-rust oil?

Why should the air film machine (bubble film machine) screw and barrel surface be coated with anti-rust oil? The bubble film produced by the air cushion film machine (bubble film machine) is a chemical product which is processed by high-quality polyethylene resin and used for packaging and filling, and is widely used in the logistics industry.
The air cushion film machine (bubble film machine) should be regularly inspected, and the air cushion film machine (bubble film machine) should be thoroughly cleaned every three months. The grease should be replaced every three months for each bearing, and the gear reducer should be replaced every six months. Replace the lubricant once and overhaul the equipment as a whole every two years. Check whether the temperature control of the air cushion film machine is intact, whether the heating device is not intact, and whether the temperature of each point is within the index range to ensure the normal operation of the machine.

Air cushion film machine (bubble film machine) must ensure cleanness when feeding the hopper, and prevent metal debris, sand and small tools from entering the material to prevent damage to the barrel and screw. If abnormal noise is found during operation, it should be immediately Parking is processed.
The air cushion film machine (bubble film machine) screw is taken out from the barrel for some reason, and should be properly handled to prevent deformation. If it is not replaced in the barrel for a long time, the screw must be vertically suspended to prevent bumping and bending. And permanent deformation, the barrel and screw surface are coated with anti-rust oil for protection.